@Amir Rahimi Thanks for the details, This capability for filter modification is offered to managed customers only, as stated in the form itself. I believe it's due to the increased risk of misuse / bypassing responsible AI criteria when filters are modified.
A 'managed customer' refers to the fact that they are on our Managed Account List (MAL). but a managed account should have an account team and thus in MSX it should have an owner.
We would recommend raising support ticket for this.